QueueScheduler & QueueEvents make the test suite suspend

This is the simplified version of our code base to reproduce the bug.

const Redis = require('ioredis')
const {QueueScheduler} = require('bullmq')

const connection1 = new Redis(6379, 'localhost')

let queueScheduler;
describe('test', ()=>{
    beforeAll(()=>{
        queueScheduler = new QueueScheduler('q1', {connection: connection1})
    })

    afterAll(async()=>{
        await queueScheduler.close()
        // await connection1.quit()
    }, 10000)
    
    it('nothin', ()=>{
        expect(true).toBe(true)
    })
})

The expected behavior is that teardown phase should successfully close the connection and test should end smoothly, but when running the test, it’s suspended and throws this warnings:

Jest did not exit one second after the test run has completed.
This usually means that there are asynchronous operations that weren't stopped in your tests. Consider running Jest with `--detectOpenHandles` to troubleshoot this issue.

When run the test with --detectOpenHandles option it complains about the Redis connection and Queuescheduler.

This condition makes our CI pipeline fail randomly because of timeout limit and I’m looking for a way to close the connections smoothly.

Environment: bullmq: 1.44.2 ioredis: 4.27.8 redis: 6.0.9

[shahinghasemi]

I just copied your snippet and run it, but the error still exists. this is my environment: node: 14.15.5 bullMQ: 1.46.1 ioredis: 4.27.8 redis: tried with 6.0.9-alpine and latest images(I run the Redis through container).

Would you tell about your environment? Is there any difference between yours and mine?

[roggervalf]

@shahinghasemi I tried your piece of code, and you need to close connection1 too:

const Redis = require('ioredis')
const {QueueScheduler} = require('bullmq')

const connection1 = new Redis(6379, 'localhost')

let queueScheduler;
describe('test', ()=>{
    beforeAll(()=>{
        queueScheduler = new QueueScheduler('q1', {connection: connection1});
    })

    afterAll(async()=>{
        await queueScheduler.close()
        await connection1.quit()
    }, 10000)
    
    it('nothing', ()=>{
        expect(true).toBe(true)
    })
})